Synthesis and Characterisation of Calcium Carbonate Aragonite Nanocrystals from Cockle Shell Powder (Anadara granosa)

Table 1

(a) Elemental compositions of calcium carbonate nanocrystals and (b) elemental compositions of cockle shell powder.

(a)  

Spectrum	Carbon	Oxygen	Sodium	Calcium	Total (%)
Spectrum 1	20.18	59.51	0.53	19.78	100.00
Spectrum 2	14.44	46.73	0.30	38.53	100.00
Spectrum 3	13.57	28.14	0.18	58.11	100.00
Mean	16.06	44.79	0.34	38.81	100.00
Standard deviation	3.59	15.78	0.17	19.17
Max.	20.18	59.51	0.53	58.11
Min.	12.65	28.14	0.18	19.78

(b)  

Spectrum	Carbon	Oxygen	Sodium	Calcium	Aluminium	Total (%)
Spectrum 1	22.18	50.51	0.53	27.60	0.17	100.00
Spectrum 2	12.44	46.32	0.30	30.53	0.41	100.00
Spectrum 3	13.57	37.14	0.18	58.11		100.00
Mean	16.06	44.79	0.34	38.81		100.00
Standard deviation	3.59	15.78	0.17	19.17
Max.	19.82	69.52	0.36	58.11
Min.	13.57	26.42	0.16	23.87